铁磁-量子点-超导体异质结中的自旋电导(英文)  

Spin conductance in ferromagnet/quantum dot/superconductor junctions

作　　者：宁文婷[1] 金彪[1] 

机构地区：[1]中国科学院大学物理学院,北京100190

出　　处：《中国科学院大学学报（中英文）》2014年第1期17-23,共7页Journal of University of Chinese Academy of Sciences

基　　金：Supported by National Natural Science Foundation of China(10874241)

摘　　要：分析铁磁-量子点-超导体异质结中,量子点内存在自旋翻转相互作用时的自旋输运问题.采用非平衡格林函数方法,计算隧穿自旋流和自旋电导.结果表明,即使在一般温度和自旋极化强度下,自旋电导依赖于铁磁体内交换场方向,产生可控的巨自旋磁阻效应.We analyze the spin transport in a ferromagnet/quantum dot/superconductor junction by assuming spin-flip interaction on the quantum dot. The nonequilibrium Green＇s function method is employed to calculate the tunneling spin current and spin conductance. It is shown that the spin conductance depends sensitively on the orientation of exchange field in the ferromagnet, leading to a controllable giant spin tunneling magnetoresistance effect, even in the moderate temperature and spin polarization regime.

关 键 词：自旋翻转 同自旋带Andreev反射 巨自旋磁阻 

分 类 号：O469[理学—凝聚态物理]